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    <title>css_背景演示</title>
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<h1>标题</h1>
<p>背景图片固定</p>
<p>背景图片固定</p>
<p>背景图片固定</p>
<p>背景图片固定</p>
<p>背景图片固定</p>
<p>背景图片固定</p>
<p>背景图片固定</p>
<p>背景图片固定</p>
<p>背景图片固定</p>
<p>背景图片固定</p>
<p>背景图片固定</p>
<p>背景图片固定</p>
<p>背景图片固定</p>
<p>背景图片固定</p>
<p>背景图片固定</p>
<p>背景图片固定</p>
<p>背景图片固定</p>
<p>背景图片固定</p>
<p>背景图片固定</p>
<p>背景图片固定</p>
<p>背景图片固定</p>
<p>背景图片固定</p>
<p>背景图片固定</p>
<p>背景图片固定</p>

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